No, but I recommend you to use Unlz-gba, or any Pokemon sprite-editing tool. I'm no good with hex hacking yet, so I don't know much.

Hahaha, thank you. But it took me a whole day to make those three. =_=

I don't know if my answer was quick enough for that quick question, but here it is anyway:

*Shane, is an optional opponent in the game. You can go sparring with her, anytime throughout the whole demo. Don't worry though, by the end of the demo you'll obtain something strong enough to defeat her.

**About the CARD KEY's, you can't use them yet until you find your best friend / rival. He's at the south-eastern part of Aurora City, talking to a merchant.

After talking to him, he will give you your TICKET.

***Yes, that's the Giveaway Patch.
You need to patch it to another clean Fire Red ROM.
You can continue your save file/s by simply renaming the .sav files or .sgm files to the name of the ROM that you'll be using.